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Inhomogeneities in acid-catalyzed titania-silica and zirconia-silica xerogels as revealed by small-angle x-ray scattering
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UNSPECIFIED (2000) Inhomogeneities in acid-catalyzed titania-silica and zirconia-silica xerogels as revealed by small-angle x-ray scattering. JOURNAL OF MATERIALS RESEARCH, 15 (9). pp. 1998-2005. ISSN 0884-2914.
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Abstract
The small-angle x-ray scattering (SAXS) technique was used to investigate inhomogeneities on the scale of 10 to 600 Angstrom in acid-catalyzed titania-silica and zirconia-silica xerogels. SAXS of (TiO2)(SiO2)(1-x) and (ZrO2)(x)(SiO2)(1-x) xerogels with x < 0.1, in which there was no phase separation, showed the presence of two types of inhomogeneity. For Q < 0.05 Angstrom(-1) there was a clear departure from Pored scattering which showed that xerogel powder particle surfaces were rough. For 0.1 < Q < 0.4 Angstrom(-1) there was a plateau feature corresponding to micropores within the silica-based network, and this feature changes with heat treatment. SAXS of xerogels with x > 0.3 showed the presence of phase-separated regions of metal oxide, which were initially amorphous and crystallized at higher temperatures. A (TiO2)(0.18)(SiO2)(0.82) xerogel that was not initially phase separated became phase separated after heat treatment at 750 degrees C due to reduced solubility of Ti in the silica network.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||
Journal or Publication Title: | JOURNAL OF MATERIALS RESEARCH | ||||
Publisher: | MATERIALS RESEARCH SOCIETY | ||||
ISSN: | 0884-2914 | ||||
Official Date: | September 2000 | ||||
Dates: |
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Volume: | 15 | ||||
Number: | 9 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 1998-2005 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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